#!/usr/bin/env python3

# Copyright (c) 2020-2021 Fpemud <fpemud@sina.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.


import sys
import pam
import click


@click.command()
@click.option('--user', default='root', help='username for authentication.')
@click.option('--password', prompt=True, hide_input=True,
              help='Password of the user.')
@click.option('--stack', default='login', help='PAM stack to test.')
@click.option('--expectfail', is_flag=True,
              help='invert return code (True if PAM stack failed, False if success).')

def pam_auth(user, password, stack, expectfail):
    """A basic testing programm for PAM tests."""
    failed = True

    p = pam.pam()
    if p.authenticate(user, password, service=stack):
        failed = False

    click.echo(f'authenticating user { user } in PAM stack {stack}, status: PAM code {p.code}, PAM reason {p.reason}')
    if (not expectfail and not failed) or (expectfail and failed):
        sys.exit(0)
    sys.exit(1)


if __name__ == '__main__':
    pam_auth()